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The grey painted commercial scrolls are made by Danfos. Most places that sell Danfos compressors will have a crossover list to show which model matches with a given Trane commercial compressor part/model number.
It isn't just a crossover to a similar product, it is a crossover to the exact same compressor, just painted Danfos blue, and usually >20% cheaper than Trane wants for it.

The suction lines probably corrode faster since they will sweat in cooling mode, wetting the salt on the metal. corrosion is an electrical process, and salt water or brine work really well for that.

also, you have copper and steel in contact at that point, so there's galvanic corrosion there too, I imagine. I know there's a plastic seal in the joint, but no plastc ring between the pipe and nut, like on a dielectric union.

Do the compressors have blankets on them or are they exposed. maybe washing the salt off and covering the comps to keep salt spray off will help.

If you coat the fittings, the coating must be 100%, or pitting will be much worse wherever any salt gets through

Trane has done away with the roto lok compressor fittings on most units as for the alliance scroll its a alliance between copeland and trane ,the only difference is the roto lok fitting and the color .so far they still have the roto lok on the ones i have seen

The grey painted commercial scrolls are made by Danfos. Most places that sell Danfos compressors will have a crossover list to show which model matches with a given Trane commercial compressor part/model number.
It isn't just a crossover to a similar product, it is a crossover to the exact same compressor, just painted Danfos blue, and usually >20% cheaper than Trane wants for it.

I was asking about the use of the oddly shaped orange painted Voyager units, fat on the bottom. I thought they were Maneurop.

CRC softseal is similar to cosmoline. In harsh environments I paint with marine grade antiseize. Of course your probably not going to paint an entire compressor. Is it possible to keep it in check a little if you constantly touch up paint? What if you saved used motor oil and poured it on comp and roto loks monthly?- ok the last one was a joke.